将下列句子排成一段通顺的对话。
1. Why does the car stop again?
2. Because the traffic light is red. We must stop and wait for the green light.
3. I can take you there by car.
4. That's great. Thank you, Mum.
5. Because some people are crossing the road. We should stop and let them go first.
6. How do I get to the museum, Mum?
7. Why does our car stop here?
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